Daniel,
Welcome to the world of investing! You're in the right spot to learn about investing. I suggest that you start attending REIA,(Real estate investment association), meetings in your area. You can Google them. These meetings can be a valuable source for learning the business and are typically a good source to network with others in the business.
You didn't say where you want to invest. I would suggest you start locally. Long distance investing can be tricky. Even locally, you need a team. You might want to talk to the investors you already know and ask them for referrals on a good solid contractor and handyman crew. You'll need them for doing repairs and rehabbing. Also find yourself a solid property management company. Quality property management is key to your profits.
BP has worksheets you can use to calculate the "numbers" on rentals. I don't know where you're investing, so I can't give you specific numbers, as to where your profit should be. But in Illinois and Indiana, we won't sell an investor a rental, unless it's at 9% or above.
There's so much more to the mix, but I hope this helps. Best of luck to you.